Physics
During uniform motion of an object along a straight line, its ________ remains constant with time.

Acceleration
Velocity
Force
Deceleration

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of water is greater than its adhesion with glass.
density of mercury is greater than that of water.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.

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